INTRODUCTION This e-book contains 100 transistor circuits. The second part of this e-book will contain a further 100 circuits. Most of them can be made with components from your "junk box" and hopefully you can put them together in less than an hour..

Reverse-engineering the pinout of vacuum-fluorescent displays (VFDs ... Knowing the theory of operation, the meaning of the labels are clear: F+/F- for the filament, G1-G11 for grid, and P1–18 for the phosphor.